function copyToClipboard(txt) { 
      if(window.clipboardData) {      
              window.clipboardData.clearData();      
              window.clipboardData.setData("Text", txt); 
			  alert("复制成功！");
      } else if(navigator.userAgent.indexOf("Opera") != -1) { 
           window.location = txt;      
      } else if (window.netscape) {
           try {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");      
           } catch (e) {      
                $('#browserinfo').html("<FONT COLOR='#FF0000'>当前浏览器无法自动复制到剪贴板，请使用Ctrl+c手动复制</FONT>");      
           }      
           var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);      
           if (!clip)
                return;      
           var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);      
           if (!trans)      
                return;      
           trans.addDataFlavor('text/unicode');      
           var str = new Object();      
           var len = new Object();      
           var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);      
           var copytext = txt;      
           str.data = copytext;      
           trans.setTransferData("text/unicode",str,copytext.length*2);      
           var clipid = Components.interfaces.nsIClipboard; 
		    
           if (!clip)      
                return false;      
           clip.setData(trans,null,clipid.kGlobalClipboard);
		   alert("复制成功！");
               
      }      
 } 
